Figure 1. PCA analysis of EMs microarray candidate datasets. PCA analysis was performed in each microarray dataset: (A) GSE7305, (B) GSE7307, (C) E-MTAB-694, (D) GSE51981, and (E) GSE6364. (F) Datasets that showed good performance in the PCA analysis were selected to merge. (G) PCA analysis was performed after batch effect adjustment. EMs, endometriosis; PCA, the principal component analysis.